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    <head>
        <meta charset="UTF-8">
        <title>格式标签</title>
        <hr color="black">

        <body bgcolor="#FF44AA" align="center">
            <i>斜体字</i>
            <br>
            <b>粗体字</b>
            <br>
            <ins>插入字</ins>
            <br>
            <del>删除字</del>
            <br>
            10<sup>2</sup>
            <br>
            10<sup>3</sup>
            <br>
            H<sub>2</sub>O
            <br>
            CO<sub>2</sub>
        </body>
    </head>
</html>